Chain saw teeth



1 June 13, 1944. J. DAY 2,351,112

CHAIN SAW TEETH Filed Oct. 8, 1942 fizz/B17201" JaBEEaY June 13, i

- CHAIN saw TEETH Jabe Day, Courtenay, British Columbia, Canada Application October 8, 1942, Serial No. 461,320 In Canada October 6, 1941 1 Claim. (o1. 143-435) This invention relates to improvements in chain saw links.

An object of the present invention is the provision of chain saw links which cut the wood out cleanly.

Another object is the provision of chain saw links capable of cleaning out all the sawdust.

Another object is the provision of chain saw teeth having a tendency to dig down into the wood as they are moved thereover.

A further object is the provision of chain saw cutter teeth requiring very little setting.

A still further object is the provision of chain saw teeth designed to reduce the amount of power necessary to draw them through the wood.

With these and other objects in view, the present invention consists essentially of a chain saw link comprising a body, a lug projecting downwardly from the lower edge of the body, a tooth at the upper edge of the body, said tooth projecting upwardly from the body and extending outwardly beyond at least one side thereof, and a cutting tip formed at the outer forward corner of the tooth, as more fully described in the following specification and illustrated in the accompanying drawing, in which Figure 1 is a plan view of a length of a chain saw incorporating this invention,

Figure 2 is a side elevation of the chain saw length,

Figure 3 is a vertical section taken on the line 3-4 of Figure 2,

Figure 4 is a vertical section taken on the line 4-4 of Figure 2, and

Figure 5 is a vertical section taken on the line 5-5 of Figure 2.

Referring more particularly to the drawing, I and II are cutter links having cutter teeth I2 and I3, respectively, at their upper edges. A raker link It is located between the links III and II and it has a raker tooth I at its upper edge. The links Ill, II and It are pivotally connected together by connecting links I6 having rivets I1 extending therethrough adjacent the opposite ends thereof.

The only difference between the links Ill and II is that their respective teeth I2 and I3 are located on opposite sides of the chain saw, and, therefore, a description of link II will be suflicient for both these links.

The cutter link consists of a body I8 having a lug 20 projecting downwardly therefrom. The body has a curved end 2I at one end and a shoulder 22 at its opposite end, which is formed with a curve 23 along its lower edge.

. The cutter tooth I3 has a cutting edge 24 formed along its forward edge. This cutting edge is preferably concave, as shown. Another cutting edge 25 is formed along the outer edge of the tooth and a cutting tip 26, in the form of a point, is found at the outer forward corner of the tooth. The outer cutting edge preferably slopes towards the body I8 from its forward end.

The tooth I3 extends outwardly beyond the side of the body It and it extends downwardly along said side to form a shoulder 21 having curved sides 28 which extend around the curved ends of the adjacent connecting links I6. Actually, the tooth I3 partially overlaps the body It at its upper edge, as clearly seen in Figure 5.

V The raker link I4 is also formed with a body I 8 in the same form as that of the cutter link I3 and having a lug 20 projecting downwardly from its lower edge. The raker tooth l5 projects upwardly from the upper edge of the link and it extends outwardly from both sides of. the body I8, see Figure 4. The tooth I5 is formed with a wide cutting tip 30 at its outer forward corner and its forward edge 3| is preferably concave. The outer edge 32 preferably slopes downwardly towards the body from its forward end and the whole tooth may flare out from its base upwardly. towards the cutting tip 30, as clearly shown in Figure 4.

When arranged in a chain saw, there is a cutter link at each end of the raker link. The cutter teeth I2 and I3 are arranged on opposite sides of the chain and each of these teeth may be set outwardly slightly, as shown in Figures 3 and 5. The width of the raker tooth I5 at its cutting tip 30 is such that the latter is just fractionally narrower than the distance between the vertical planes in which the tips 26 of the cutter teeth travel. When the links are in line, the shoulder 22 of each link rests on the curved end 2| of the following link. The lugs 20 run in the slots of the cutter bar and around the driving sprocket of the saw (not shown) in the usual manner.

With this arrangement, the cutting edges 24 and 25 of the cutter teeth out through the wood and the tips 30 of the raker teeth, being substantially as wide as the transverse distance between the planes in which the cutter tips 25 travel, clean out all the cut wood or sawdust. The concave shape of the cutting edges 24 of the cutter teeth and of the forward edges 3| of the raker teeth, has a tendency to force the tips 26 and 30 down into the wood to improve the cutting qualities of the teeth. In fact the curved edges 3i of the raker teeth cause the latter to act as planes to remove shavings instead of chewing and splitting the wood up into sawdust.

With the shoulders ll, it is possible to place .the teeth l2 and II well over to the sides of the chain saw so that very little setting of these teeth is required in order to form a keri in the wood or sumcient width to permit the whole chain saw to pass therethrough.

Various modifications may be made in this invention without departing from the spirit 10 thereof or the scope of the claims, and therefore the exact forms shown are to be taken as illustrative only and not in a limiting sense, and it is desired that only such limitations shall be placed thereon as are disclosed in the prior art or are 15 set forth in the accompanying claim.

What I claim as my invention is:

A chain saw having cutter teeth and raker teeth pivotally connected by side links, each of the side links having rounded ends, each of the cutter links having one end rounded and a shoulder formed at its outer end with the curved portion projecting over the curved portion or the adjacent cutter or raker link. each cutter tooth having a cutting edge formed along its forward end and another cutting edge formed along the outer edge of the tooth terminating in a point. said outer cutting edge sloping towards the body of the tooth from its forward end. the portion oi. the cutting tooth forming the cutter edges extending beyond the side oi the body portion and extending downwardly along the said side to form a shoulder having curved sides extending around the curved end of the adjacent connecting links as well as partly over the body portion, each raker link being formed with a body portion of similar form to the cutter link and having a raker tooth projecting upwardly from the upper edge oi the link, then extending outwardly from both sides of the Body to form a wide cutting edge with 20 a forward concave face.

J ABE DAY. 

